For fear of starting a thread that has been done before (I really could not find one) and of sounding ignorant, could some of you please give a general tutorial of the impact of the bore on playing and sound. For instance where on the horn is the bore measured? What is considered a large/medium/small bore? I have seen many comments on this site talking about bore as if we all knew just what it is. If you don't know where you are going it doesn't matter how you get there!